Wrist-pin grinder



J. SINGER.

WRIST PIN GRINDER.

APPLICATION FILED mu. 2. 1920.

Patented; 061:. 11, 1921.

' To all whom it may concern:

PATENT OFFICE.

JOSEPH SINGER, OF LOS ANGELES, CALIFORNIA.

WRIST-PIN GRINDER.

Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed January 2, 1920. Serial No. 349,012.

Be it known that I, JosnPH SINGER, a citizen of the United States residing at Los Angeles, in the county of s Angeles and State of California, have invented new and useful Improvements in Wrist-Pin Grinders, of which the following is a specification.

This invention relates to machine tools and especially to grinding machines, and has for its object to provide improved means for facilitating and increasing the rapid ty and accuracy by which cylindrical bod es can be ground true and polished, and the invention consists of the construction and details an embodiment of which is illustrated in the accompanying drawings and described and claimed herein.

Figure 1 is a, perspective of the improvement as mounted on the bed of a grinding machine.

Fig. 2 is a perspective of the rear face of the attachment.

Fig. 3 is a central,v vertical section through the apparatus showing the mode of operation.

This device is especially designed to facilitate the grinding and polishing of cylindrlcal objects such as wrist pins of internal combustion engines although other cylindrlcal bodies may be equally as well turned and polished in the machine. Sucha wr st pin is indicated at 2 in Fig. 3 as being disposed against one edge of a polishing or .grinding wheel W mounted on a shaft 3 driven by any suitable means and the wrist pin 2 is supported so as to rotate upon two lines of support as formed by the adjacent surfaces of upper and lower parallel cylinders or rods 4 and 5 so that the wrist pin 2 can frictionally roll on these supporting members 4-5 when it is engaged with the '"periphery of the grinding wheel W.

The upper cylindrical supporting .r od it is provided with a polygonal end portion 4:

by which it may be successively or suitably turned to present difierent longitudinal lines of its surface to take up the wear during the use of the apparatus. The rod 4: is shown as extending longitudinally along a face plate 6 which is provided with a concave longitudinal seat 7 so. that the rod 4 has a substantial backing and will not yield or be pressed out of alinement while in use.

The ends of the rod at are shown as enga ed between pairs of outwardly projecting lips 88 formed on or attached to the face plate 6. This plate is also provided with a forwardly extending lower flange 10 through which there are threaded a pair of set screws 11 the upper ends of which engage a longitudlnally extending rest 12 vertically slotted as at 13 to receive clamping screws or bolts 14 passing therethrough and threaded on the lower front portion of the face plate 6.

The ends of the rest 12 are shown as provided with pairs of upwardly extending lips 15 between which the lower supporting rod or bar 5 is supported. The mouths or openmgs between the edges of the several pairs of lips 45 are slightly less than the diameterof the adjustable supporting rods 4 --5 so that the latter cannot be moved laterally from their rests but are inserted only by endwise movement into the respective mouths. The rod 5 is seated in a concave longitudinal groove or seat 16 in the upper face of the rest 12.

The rest is designed to be vertically adjusted by means of the set screws 11 so as to providefor the adjustment relatively of the supporting rods 41-5 to take the different sizes of cylindrical objects 2 that may bemounted in the machine.

'The face plate 6 with the several parts mounted thereon is capable of being pivoted so as to change the an lar relation of the rods 4-5 as to the horlzontal and may also be shifted in a vertical plane, and this is accomplished by providing a pivot pin or fulcrum member 18 in a main carrying frame 19 that may be suitably secured to the bed or table B of the grinding machine to which the attachment may be applied and may be fastened as by means of a center bolt 20.

The pin 18 is vertically adjustable in a slot 21 formed in the back plate 19 and is engaged by a supporting screw 22 threaded through the pin 18 and having at its upper gr d 2. head 23 resting on the top edge of the back plate 19.

From the above it will be seen that by turningthe screw 22 the pin 18 with the face plate 6 mounted thereon can be vertically adjusted relative to the shaft 3 of the grinding wheel so as to compensate for wear of the wheel or for the use of wheels of different sizes. The plate 6 can be tilted about the fulcrum or pin 18 and is clamped in the desired position by means of clamp bolts 24 extending rearwardly from the face plate 6 and passing through slots 25 in the back plate 19, and which slots are of such proportions as to permit the necessary freedom of movement of the bolts 24 to allow the change of position of the same. Beneath the nuts of the bolts 24 there may be placed washers 24; .to bridge over the slots 25.

The rod or object 2 to be turned or polished is held against outward movement from its supporting members 4.-5 as by front guide means here shown as comprisingnpwardly extending fingers 26 fastened suitably to the front of the rest 12. These fingers are spaced longitudinally from each other to provide for the movement of the wheel W.

Various changes may be made without departing from the spirit of my invention as claimed.

I claim:

1. In a device for grinding and polishing cylindrical objects, a rotatably mounted grinding wheel and a support for the object to be ground, comprising an adjustable support and a pair of parallel cylindrical members journaled onsaid support. and adapted to receive the object to be ground and polished, one of which cylindrical members is adjustable toward and away from the other.

2. A device for turning and polishing cylindrical objects, comprising, in combination, a grinding wheel and a support for the object to be ground comprising a pair of parallel cylindrical rotatively adjustable members rigidly supported adjacent to.the

periphery of the grinding wheel.

3. A device for turning and polishin cylindrical objects, comprising, in com ination, a grinding wheel and a support for the object to be ground comprising a pair of cylindrical members rigidly supported adjacent to the periphery of the grinding wheel, so as to provide with the wheel a three point contact with the periphery of said object. e

4. A device for turning and polishing cylindrical objects, comprising, in combination, a grinding wheel and a support for the object to be ground comprising a pair of parallel cylindrical members arranged adjacent to the periphery of the-grinding wheel, said members adapted to provide a two point support for the cylindrical object, a support for said parallel cylindrical members,---which support is mounted toswing on a vertical axis so as to adjust the positions of said parallel members relative to a horizontal plane, and one of which cylindrical members is adjustable toward and away from the other member.

5. A device for turning and polishing cylindrical objects, comprising, in combination, a grinding wheel, a support for the object to be ground comprising a pair of parallel cylindrical members rigidly supported adjacent to the periphery of t e grinding wheel, so that a three point contact will be made with the periphery of said object by the said cylindrical supports and the grinding wheel, and a rest supporting said cylindrical members which rest. is vertically adjustable with reference to the grinding wheel.

6. A device for turning and polishing cylindrical objects comprising, in combination, a grinding wheel, a support for the object to be ground comprising a pair of cylindrical members rigidly supported adjacent to the periphery of the grinding wheel, so as to provide with the wheel a three point contact with the eriphery of said object, and guard means or retaining the object from outward movement from the supports.

7. A device for turning and polishing cylindrical objects, com rising, in combination, a grinding whee, a support for the object to be ground comprising a pair of parallel cylindrical members rigidly supported adjacent to the periphery of the grinding wheel, so that a three point contact will be made with the periphery of said object by the said cylindrical supports and the grinding wheel, a rest supporting said cylindrical members and vertically adjustable with reference to the grinding wheel, and a support for the said rest pivotally mounted on a frame to longitudinally tilt the cylindrical members.

8. A device for turning and polishing cylindrical objects, comprising, in combination, a grinding wheel, a pair of parallel cylindrical supports, on which the object may roll while being engaged by. the wheel rigidly mounted on an adjusgble suppoft adjacent to the periphery ofthe wheel, said cylindrical supports and said wheel making a three pointcontact with the periphery of the object, the object being freely movable longitudinally on the cylindrical supports while it is being ground.

In testimony whereof I have signed my name to this specification.

JOSEPH SINGER. 

